/usr/share/doc/xloadimage/README.gz

XLOADIMAGE - X11 Image Loading Utility
WHAT IS IT?
This utility will view several types of images under X11, load
images onto the root window, or dump processed images into one of
several image file formats. The current version can read many
different image file types; for a complete list type "xloadimage
-supported".
A variety of options are available to modify images prior to viewing.
These
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